Carbureter



G. N. GO ODBICH.

CARBVURETER.

APPLICATION FILED NOV. 28. 1919.

Patented Aug. 16,1921.

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UNITED STATES' PATENT OFFICE.

ononon eoonnrorr, on'nn'rn'orr, MICHIGAN.

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T 0 all to 730m it may concern *Be it known that Gannon N. Goonniorr, a citizen of the United Qtates, residing at Detroit, in the county Wayne and State of- Michigan, have invented certain new and useful Improvements in Carbureters, of which the following is a specification.

This invention relates to carbureters and has for its object an arrangement for supplying a large quantity of fuel oil when the throttle is suddenly thrown open to enable the engine .to accelerate speedily and the car to quickly pick up." I term the arrangement an accelerating well, which may not be strictly accurate but which serves wel to indicate its purpose. V

The improvement consists in providing a control for the accelerating 'wellwliich will provide quick action in filling up and which will result in dependable action.

In the drawings Figure 1 1s a vertical section of a carbureter showing my accelerator.well, certain parts being shown in elevation.

Fig.2 is a fragmentary section of a similar character showing a slightly modifi d form of accelerating well.

- ca'design'ates the throat'or the mixing chamber ,lof the carbureter; b 1 a Venturi tube. I0 designates the intake; (2 the float chamber; 6 the customary needle valve controlled bythe floatthrough thelevers 7'. g

is a passageway leading from the'float chamher to the fuel nozzle h, the orifice in which is controlled by the needle valve This is one form ofcarbureter construction.

- For high'engine speeds, where there exists the necessity for weakening the mixture, some sort of compensating device is neces sary. This is achieved in some carburetors by the compensating well i into which dips the pipe is. Thispipe connects with the throatof the carbureter at the edge of the throttle valve Z which has clearance at the sides. When the throttle is closed, practically all the fuel will be taken through the pipe, air being taken in alsothrough the pipe at the ports mi This furnishes the fuel mixture for low speed idling. .When the throttle'is partially opened the fuel is taken both through the pipe and through the nozzle. When the throttle is opened wide the fuel oil in the compensating well will be 6X- hausted or nearly exhausted and hence considerable air will be taken through the well, thencethrough'the passage-way g and out I Specification of Letters Batent. Patented A 161 192L Application filfid November 28,1919. Serial no. 341,027. i

into the fuel passage 9 to the nozzle. The

passage-way p connects the upper portion of the well with the throat of the carburet'er on the engine side of the'throttle. The float valve g is provided which carries a needle valve 1" adapted to close the openingleading into the passage-Way p.

The action is as follows: hen the engine is running on closed throttle, the suc tion through the passage-way p is relatively strong and the well will soon fill up with fuel until the float g closes olfthe suction. This forms what might be termed a stand pipe or a high reservoir of fuel oil. It is always present with a closed throttle. Supposing the throttle :to beopened,"the depression at the opening through the passage-way suddenly falls and it is insuflicient to hold up the standing'column of fuel oil in the accelerating well. This immediately falls and 'discharges'through the'orifice 0, part ofit discharging back into the float chamber and part flooding the orifice of thenozzle. This forms an excess supply of fuel to give a relatively rich mixture for quick'accelera- It is not broadly new to provide a well for accelerating purposes and in which the fuel level is held higher than the first chamber level by the influence of the engine suc tion at closed throttle. But, heretofore, the

fuel level hasbeen maintained at the de-- sired point by providing an opening to the atmosphere in the well whichfso weakens the effect of engine suction on the column of fuel in the well as to'prev'ent it rising above a given level. However, this means of control is obj ectionabl'ein two ways. The eflect'of the suction is so weakened by the air openingas to make the filling up action slow and the well unavailable for a quick repeat of the accelerating action. Secondly,

the well being open to the atmosphere; to cut down the suction eflectyif the air port becomes clogged or partially clogged" by any foreign matter such as bugs or dust drawn thereinto, then the raw fuel will be drawn directly into the engine. lVith my arrangement a reliable control is provided which is removed from atmospheric conditions and the full pull of the engine suction is had for refilling. 1 have found that the depression through the passage-way p, at closed throttle, is sufficient to raise a column of water 217 inches or 16 inches of mercury. This depression, when the throttle is suddenly opened, drops to nearly zero and then rises slightly. With the air regulated control for level of oil, I have found that in such constructions, selected 1 for examination, that the depression in the accelerating well was only 2.5 of water or .188 of mercury. From this comparison the superior capacity of my improved control in refilling will be evident.

In Fig. 2 the same arrangement is shown except a metered plug as is used at the opening into the carburetor throat and a plug 1/ to gain access to this plug.

l fhat I claim is: i

1. In carbureting apparatus, the combination with an intake line, of a throttle valve therein, a fuel nozzle, an accelerating well closed. to the atmosphere and having a con trol for permitting the engine suction at closed throttle to hold the fuel level therein at substantially a given point above the float chamberlevel, and a passage-way leading from the accelerating well to the intake line for discharging the oil from the accelerating well thereinto when the throttle is suddenly opened.

In a carbureting apparatus, the combination of an intake passage, a throttle valve therein, a fuel nozzle on the side of the tirottle valve opposite the engine, an accelerator well having the capacity of holding a higher column of oil than the float chamber, a passage-way leading from the accelerating well into the intake between the throttle and the engine whereby when the throttle is closed the accelerating well fills up with oil, means for automatically cutting ofl' the'suction when the accelerating well is filled, and a passage-way leading from the accelerating well into the intake line for allowin the dischar e of the excessive oil into the intake when the throttle is suddenly opened and the. suction influence on the oil in the accelerating well is weakened.

3. In a carbureting apparatus, the combination of an intake passage, a fuel nozzle therein, a throttle valve between the fuel nozzle and the engine, a float chamber, an oil passage leading from the float chamber to the fuel nozzle, an accelerating well closed to the atmosphere and having a passage-way connecting with the oil passage that leads from the float chamber to the fuel nozzle, said well also having a passage-way connecting with the intake between the throttle valve and the engine, the said accelerating well being provided with an automatic valve for controlling the said passage-way connecting with the said intake to thereby control the engine suction so that the well fills up only to a determined level higher than the float chamber level when the throttle valve is closed and when the throttle valve is open the said accelerating well discharges into the oil passage connecting the float chamber with the fuel nozzle to flood the said fuel nozzle.

In a carbureting apparatus, the combination of an intake passage, a fuel nozzle discharging theretinto, a throttle valve between the nozzle and the engine, a float chamber supplying the fuel nozzle with fuel oil and an accelerating well having the capacity of holding a higher level of fuel oil than the float chamber and having a passage-way connecting with the intake line between the throttle and the engine whereby when the throttle is closed suction through this passage-way fills the accelerating well, a float in the accelerator well for closing off the suction through this passage-way when the accelerating well is filled, and a passageway leading out of the accelerating well for furnishing the excess of fuel oil by the fall of the oil column in the said well when the throttle is suddenly opened and the suction through the passage-way from the accelerating well to the intake line is insufficient to hold the level of the accelerating well above that of the float chamber.

5. In a carbureting apparatus, the combination of an intake passage, a fuel nozzle leading thereinto, a throttle valve between the fuel nozzle and the engine, a float chamber supplying the fuel nozzle, an ac celerating well having the capacity of holding a higher level of fuel oil than the float chamber, a passage-way leading from the accelerating well into the intake between the throttle and the engine whereby when the throttle is closed the suction of the engine will fill up the accelerating well to a higher level than the normal fuel level, a valve for automatically cutting off the suction when the well has been filled to the desired level, and a passage-way for furnishing to the fuel nozzle the excess supply of fuel oil from the accelerating well when the throttle is opened and the depression at the passageway leading from the accelerating well into the intake line is insutficient to hold the higher level in the accelerating well.

In testimony whereof I affix my signature.

GEORGE N. GOODRICH. 

